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SMC (6850090) 685 Series PVC NSF Check Valve ; 1/2” FNPT x 1/2" FNPT Buna

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SMC (6850090) 685 Series PVC NSF Check Valve ; 1/2” FNPT x 1/2" FNPT Buna

The SMC 6850090 from the 685 Series is a PVC check valve rated for potable water systems, featuring 1/2" female NPT connections on both ends and a Buna-N seal. This NSF-certified component prevents backflow in residential and light commercial reverse osmosis systems, ensuring one-way flow protection where you need it.
SPECIFICATIONS

SMC 685 Series Check Valve Technical Details

Model Number SMC 6850090
Series 685 Series
Body Material PVC (Polyvinyl Chloride)
Seal Material Buna-N (Nitrile)
Connection Type 1/2" FNPT x 1/2" FNPT
Certification NSF Certified for Potable Water
Dimensions 5.4" x 3.3" x 1.5"
Application Reverse Osmosis & Water Filtration Systems
INSTALLATION & USE

How to Install the SMC 6850090 Check Valve

  1. Identify the flow direction marked on the valve body and orient accordingly in your system line.
  2. Wrap male NPT threads with 3-4 turns of Teflon tape, then thread into both 1/2" FNPT ports hand-tight.
  3. Use a wrench to snug connections an additional quarter turn, avoiding over-torque on PVC threads.
  4. Pressurize the system slowly and inspect for leaks at both connection points before full operation.
COMPATIBILITY

System Integration

The SMC 6850090 check valve works with any standard residential or light commercial RO system requiring 1/2" FNPT connections. It is commonly installed after RO membranes to prevent backflow from the storage tank, or between filtration stages where one-way flow protection is required. The Buna-N seal is compatible with chlorinated water and typical feed water conditions. Suitable for integration with brands including APEC, iSpring, Watts, Pentair, and other systems using half-inch threaded connections.

🔧 Pro Tip: Install check valves with the arrow on the body pointing in the direction of desired flow. If the valve is installed backwards, your system will experience zero flow and pressure buildup, which looks like a membrane failure but is simply reversed orientation.
The SMC 6850090 from the 685 Series is a PVC check valve rated for potable water systems, featuring 1/2" female NPT connections on both ends and a Buna-N seal. This NSF-certified component prevents backflow in residential and light commercial reverse osmosis systems, ensuring one-way flow protection where you need it.
SPECIFICATIONS

SMC 685 Series Check Valve Technical Details

Model Number SMC 6850090
Series 685 Series
Body Material PVC (Polyvinyl Chloride)
Seal Material Buna-N (Nitrile)
Connection Type 1/2" FNPT x 1/2" FNPT
Certification NSF Certified for Potable Water
Dimensions 5.4" x 3.3" x 1.5"
Application Reverse Osmosis & Water Filtration Systems
INSTALLATION & USE

How to Install the SMC 6850090 Check Valve

  1. Identify the flow direction marked on the valve body and orient accordingly in your system line.
  2. Wrap male NPT threads with 3-4 turns of Teflon tape, then thread into both 1/2" FNPT ports hand-tight.
  3. Use a wrench to snug connections an additional quarter turn, avoiding over-torque on PVC threads.
  4. Pressurize the system slowly and inspect for leaks at both connection points before full operation.
COMPATIBILITY

System Integration

The SMC 6850090 check valve works with any standard residential or light commercial RO system requiring 1/2" FNPT connections. It is commonly installed after RO membranes to prevent backflow from the storage tank, or between filtration stages where one-way flow protection is required. The Buna-N seal is compatible with chlorinated water and typical feed water conditions. Suitable for integration with brands including APEC, iSpring, Watts, Pentair, and other systems using half-inch threaded connections.

🔧 Pro Tip: Install check valves with the arrow on the body pointing in the direction of desired flow. If the valve is installed backwards, your system will experience zero flow and pressure buildup, which looks like a membrane failure but is simply reversed orientation.
$5.77

Original: $16.50

-65%
SMC (6850090) 685 Series PVC NSF Check Valve ; 1/2” FNPT x 1/2" FNPT Buna—

$16.50

$5.77

Description

The SMC 6850090 from the 685 Series is a PVC check valve rated for potable water systems, featuring 1/2" female NPT connections on both ends and a Buna-N seal. This NSF-certified component prevents backflow in residential and light commercial reverse osmosis systems, ensuring one-way flow protection where you need it.
SPECIFICATIONS

SMC 685 Series Check Valve Technical Details

Model Number SMC 6850090
Series 685 Series
Body Material PVC (Polyvinyl Chloride)
Seal Material Buna-N (Nitrile)
Connection Type 1/2" FNPT x 1/2" FNPT
Certification NSF Certified for Potable Water
Dimensions 5.4" x 3.3" x 1.5"
Application Reverse Osmosis & Water Filtration Systems
INSTALLATION & USE

How to Install the SMC 6850090 Check Valve

  1. Identify the flow direction marked on the valve body and orient accordingly in your system line.
  2. Wrap male NPT threads with 3-4 turns of Teflon tape, then thread into both 1/2" FNPT ports hand-tight.
  3. Use a wrench to snug connections an additional quarter turn, avoiding over-torque on PVC threads.
  4. Pressurize the system slowly and inspect for leaks at both connection points before full operation.
COMPATIBILITY

System Integration

The SMC 6850090 check valve works with any standard residential or light commercial RO system requiring 1/2" FNPT connections. It is commonly installed after RO membranes to prevent backflow from the storage tank, or between filtration stages where one-way flow protection is required. The Buna-N seal is compatible with chlorinated water and typical feed water conditions. Suitable for integration with brands including APEC, iSpring, Watts, Pentair, and other systems using half-inch threaded connections.

🔧 Pro Tip: Install check valves with the arrow on the body pointing in the direction of desired flow. If the valve is installed backwards, your system will experience zero flow and pressure buildup, which looks like a membrane failure but is simply reversed orientation.
SMC (6850090) 685 Series PVC NSF Check Valve ; 1/2” FNPT x 1/2" FNPT Buna | Isopure Water